SBTs are not assigned a frame size. The 1 1/2 mentioned by one poster is just to fill in a blank column in the stock book. All 12s and 20s are the same size. I have a 20 with an extra barrel in 12 gauge that is off another 12 gauge gun, fits perfectly. My 34" 20 also has an extra 34" 12 gauge barrel that fits just fine.
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